Steering-gear for vehicles used as trailers



I A. ARATO. STEERING GEAR FOR VEHICLES USED'AS TRAILERS.

APPLICATION FILED MAR. 12, I919.

Patenfed Ma -mien. J

5/ I IQ AZlorne U.NI1TE II) 7SV{TATESYI ATENT mice AOHILLE ABA TO, or run-m, mminssmnon 'ro rnnnucclo 'BOTIA, or minim,

ITALY.)

v gi i rsmniife -enan roe To allwfiomit a I -Be it known' that I,AoninLniARATo manufacturer, a subject of the King or Italy, and a residentyof Turin, Corso .San

Maurizio 45,- Italy, havednvnte'd certain new and useful Improvements in Steering- Gears *for Vehicles Used as Trailers, of

.which the following 'is a clear, true, and

exact specification.

This invention relates to tour wheeled vtrailer vehicles of the kind having'wheels mounted on pivoted axles or carriages and provided with steering means for causing the wheels tofollow the track of thewhjeels of the'tractor or of a precedingvehicle cure.

ing hauling. v I The. object of thisinve'ntion is to provide improved arrangement .for transmitting the deviations of the coupling between the two vehicles to the 1 trailer wheels, said arrangement-beingile'ss complicated and-cum bersome than the arrangements at present in- In the annexed drawings Figure ls'hows in plan viewthe diagram ofan embodiment of this invention and 'Fig. 2 shows in plan viewthe diagram of a modified construc I tion. s

With reference to-Fig. 1, the four wheels -m of the carriage are mounted'in pairs on the ends of axles S and. S each adapted v to rotatearound its vertical central axis withregard to the frame, this latter being not shown for sakeofclearness. Theopposite' ends of the two axles S andS' are connected together by crossties G which are connected with the axles S and S at points spaced to equal distances from the pivots C. A

At the center, of the end pieceof the vehicle ,frame and apart from the pivot point of the adjacent axle, is pivoted at C,

a movable member P toiwhich the'coupling" T is hinged to ock around a horizontal'axis, so that'the' si e movements of the couplin are; directly transmitted to the-member while said cou ling T is free formoving in vertical direction,

and pivoted axlef s respectively are spaced apart to different extents from the respective centers of rotation of said parts, the

- together by means ofi cross ties G. inemb'er Disconnected-bymeans of bars I with-the adjacent pivoted axle S',' the ratio vnnictns usnn as r'nninnns.

17 C to pivot point of bar I on the member P and distance from pivot point C of the axle purpose of causing the wheels of-the trailer to follow the trackof wheels of the tractor or i {specification of Letters l atent. Patented May 17, 1921, Application and Karen 12; 1919; Serial, No. asaz'oa I preceding. carriage. This ratio depends' -upon the particular construction of the ears that isupon' the distance between the axles .and the distance between the head-stocks of the subsequent vehicles.

By the described construction the deviations imparted to the memberIP-loy the con-- ,.pl1.ng T are transmitted under the required 'ratio and in the samedirection to the-piv- .oted axle S and the deviations-of said axle are transmitted 'tothe same extent and in, opposite d rect ons to the rear axle S. The construction according to Fig. 2 comprises two members P each pivoted around .a Vertical axis C on oneof heads ofthe car-v riage' frame, 'said members being connected Y Each between tlie distances of pivot points of bars Ion member P and. axleS from the respective centers of above stated. n

In this case the deviation impartedt'oone rotation C and being that of members P .by theicoupling -T' is'transmitted to the. same extent and inv opposite direction to the oppositememberd? and the deviation of each member P is transmitted in the-same direction and under required fratio to the adjacent pivoted axle. j t

WhatI claim as my invention and desire to secure by U, S. Letters 'Patent is: 1. In a trailer comprising front and rear pivoted parts each carrying a pair of'wheels, the combination of a member pivoted to swin swmging memberpto rotate around a horizontal axis; ties each-connected, with. the

carrying partat points located at the, same 'side of and at diil'erent distances from'the 4 at; one 'endof the trailer a'rounda 'vrtica axis; a coupling member; hinged on said I s swinging member and the adjacent wheel The member P is connected with adj acent pivoted axle S byYvrodsI-I, :and'the points of connection of said rods I with themember P M respective centers of rotation; and .cros'sjties inter-connecting the parts intended. ,to be rotated irg" oppositedirections'for steering. 1 boththe front and rear wheels in thejtracks .of the rear wheels of the pulling element.

2. In a trailer having wheels mounted on to said swinging end member and transmitting the deviations of said swinglngvmem- -ber connected with-the pulling element to the front steering part in the same direction and under reduced ratio and other ties transe mitting the deviations of said swinging end member to the rear steering parts in the opposite direction and under the same reduced ratio, said ratio being such-as to cause the front and rear wheels of thetrailer to fol-- low in the tracks of therear wheels of the pulling element.

3. In a trailer comprising pivoted parts each carrying a pair of wheels, the combinationof a member pivoted to swing at thehead of the trailer around a vertical axis, means for connecting said member with a pulling element, ties each connected with said swinging member and the adjacent wheel carrying part at. points located at the same side of andat different distances from the respective centers of rotation to cause the front wheels of the trailer to substantially follow in the tracks of the rear wheels of the pulling element, and cross ties interconi necting the front and rear wheel carrying parts co-transmit the deviations of the front wheel carrying parts to the rear wheel carryingparts in reverse direction and under the same reduced ratio to cause the rear wheels'to substantially follow in the tracks of the front wheels.

In witness whereof-I have hereunto signed presence of two subscribing AoHILLE ARATO.

my name in the witnesses.

Witnesses: v

ANDREA LINNo, Y RICHARD BaHAvENi 

